MOBILIZATION PROCESSES FROM VANADIUM ALLOYS DURING OXIDATION

The mobilization of several elements from vanadium alloys in flowing a ir was measured for temperatures between 600 and 1200 degrees C. Alloy s with nominal compositions of V-5Cr-5Ti and minor amounts of calcium, scandium, and manganese added to simulate transmutation products were prepared by powder metallurgy. Mobilization of the three major alloyi ng elements and the three minor additions was measured using a transpi ration test method. Volatilization of sodium was modeled based upon eq uilibrium concentrations of this metal on the oxide scale resulting fr om the dissociation of Na2O, the concentrations of vanadium oxides (V2 O4 and V2O5), and the oxygen content in the gas above the sample.